/Engine/Source/Runtime/AudioMixer/Public/AudioMixerDevice.h
virtual void AddSpectralAnalysisDelegate ( [USoundSubmix](API\Runtime\Engine\Sound\USoundSubmix) * InSubmix, const [FSoundSpectrumAnalyzerDelegateSettings](API\Runtime\Engine\Sound\FSoundSpectrumAnalyzerDelegateSe-) & InDelegateSettings, const [FOnSubmixSpectralAnalysisBP](API\Runtime\Engine\Sound\FOnSubmixSpectralAnalysisBP) & OnSubmixSpectralAnalysisBP )